title: Graded expression of netrin-1 by specific neuronal subtypes in the adult mammalian striatum.
abstract: Netrins are a family of secreted proteins that function as axon guidance cues during neural development. High levels of netrin-1 expressed by the embryonic ganglionic eminence, the precursor of the adult striatum, direct axons that pioneer the internal capsule. Here we describe netrin-1 expression by neurons distributed throughout the striatum of the adult mouse. Differences were detected in the number and type of neurons expressing netrin-1 in different regions of the striatum. Most neurons in the ventral striatum, including projection neurons and cholinergic interneurons, express netrin-1. In contrast, netrin-1 expression is largely limited to cholinergic interneurons in the dorsal striatum, and the proportion of cholinergic interneurons that express netrin-1 decreases along rostral-caudal and ventral-dorsal axes. Regional differences in expression in the adult striatum suggest that netrin-1 not only influences the development of striatal circuitry but may also participate in the maintenance and plasticity of connections in the adult brain.
authors.affiliation: Centre for Neuronal Survival, Montreal Neurological Institute, McGill University, 3801 University Avenue, Montreal, Quebec, Canada H3A 2B4.
authors.forename: R A
authors.initials: RA
authors.lastname: Shatzmiller
authors.forename: J S
authors.initials: JS
authors.lastname: Goldman
authors.forename: L
authors.initials: L
authors.lastname: Simard-Emond
authors.forename: V
authors.initials: V
authors.lastname: Rymar
authors.forename: C
authors.initials: C
authors.lastname: Manitt
authors.forename: A F
authors.initials: AF
authors.lastname: Sadikot
authors.forename: T E
authors.initials: TE
authors.lastname: Kennedy
mesh_terms: D000818:Animals; D002795:Choline O-Acetyltransferase / Q000235:genetics / Q000378:metabolism; D003342:Corpus Striatum / Q000166:cytology*; D015870:Gene Expression / Q000502:physiology*; D051379:Mice; D008822:Mice, Transgenic; D009414:Nerve Growth Factors / Q000235:genetics / Q000378:metabolism*; D009419:Nerve Tissue Proteins / Q000378:metabolism; D000075388:Netrin-1; D009474:Neurons / Q000145:classification* / Q000378:metabolism*; D012333:RNA, Messenger / Q000378:metabolism; D025521:Tumor Suppressor Proteins / Q000235:genetics / Q000378:metabolism*; D001616:beta-Galactosidase / Q000235:genetics / Q000378:metabolism
chemical_list: D009414:Nerve Growth Factors; D009419:Nerve Tissue Proteins; C000617353:Ntn1 protein, mouse; D012333:RNA, Messenger; D025521:Tumor Suppressor Proteins; D000075388:Netrin-1; D002795:Choline O-Acetyltransferase; D001616:beta-Galactosidase